#include <vector>
#include <memory>
#include <algorithm>

// Define precision type (double precision in original)
using Real = double;

class ContactInitializer15 {
public:
    // Main initialization routine
    void initialize(
        std::vector<int>& masterArray,      // Main data array (equivalent to MA)
        int contactInterfaceId,             // Contact interface ID (N)
        int totalNodes,                     // Total number of nodes (NUMNP)
        bool isDistributedMemory,           // Parallel execution flag (IDMP)
        int mailBoxSizeA,                  // MPI mailbox size A (LGMAILA)
        int mailBoxSizeB                   // MPI mailbox size B (LGMAILB)
    ) {
        // Extract basic parameters
        int numSegments = getIntegerParam(masterArray, 1, contactInterfaceId);
        int numMasterNodes = getIntegerParam(masterArray, 2, contactInterfaceId);
        int numSlaveNodes = getIntegerParam(masterArray, 3, contactInterfaceId);
        int numNodes = getIntegerParam(masterArray, 4, contactInterfaceId);
        int contactType = getIntegerParam(masterArray, 5, contactInterfaceId);
        Real scaleFactor = getRealParam(masterArray, 1, contactInterfaceId);

        // Allocate memory for various arrays
        allocateMemory(masterArray, numSegments, numMasterNodes, numSlaveNodes, 
                      totalNodes, isDistributedMemory, mailBoxSizeA, mailBoxSizeB);

        // Count boundary elements
        countBoundaryElements(masterArray, contactInterfaceId, numMasterNodes);

        // Check master segments are of rigid body type 4
        checkMasterSegments(masterArray, contactInterfaceId, numSegments, totalNodes);

        // Get minimum area parameter
        Real minArea = getRealParam(masterArray, 17, contactInterfaceId);

        // Allocate temporary arrays and MPI buffers if needed
        int mpiBufferSize = 0;
        if (isDistributedMemory) {
            mpiBufferSize = 2 * std::max(mailBoxSizeA, mailBoxSizeB);
            allocateMPIBuffer(masterArray, mpiBufferSize);
        }

        // Allocate temporary working arrays
        allocateTemporaryArrays(masterArray, totalNodes);

        // Compute stiffness and thickness properties
        Real maxStiffness = 0.0;
        computeStiffnessProperties(
            masterArray, contactInterfaceId, totalNodes, numSegments, 
            numSlaveNodes, scaleFactor, minArea, mpiBufferSize, maxStiffness
        );

        // Store computed parameters
        updateParameters(masterArray, contactInterfaceId, minArea, maxStiffness);

        // Clean up temporary allocations
        cleanupTemporaryArrays(masterArray);
        if (isDistributedMemory) {
            cleanupMPIBuffer(masterArray);
        }

        // Update contact interface label
        updateInterfaceLabel(contactInterfaceId);
    }

private:
    // Helper methods
    
    int getIntegerParam(const std::vector<int>& masterArray, int paramIndex, int contactId) {
        // Implementation would extract integer parameter from master array
        // Equivalent to IPARMGET in original
        return 0;
    }
    
    Real getRealParam(const std::vector<int>& masterArray, int paramIndex, int contactId) {
        // Implementation would extract real parameter from master array
        // Equivalent to RPARMGET in original
        return 0.0;
    }
    
    void allocateMemory(
        std::vector<int>& masterArray, int numSegments, int numMasterNodes,
        int numSlaveNodes, int totalNodes, bool isDistributedMemory,
        int mailBoxSizeA, int mailBoxSizeB
    ) {
        // Allocate shadow master array (3*NRTM)
        allocateShadowMasterArray(masterArray, 3 * numMasterNodes);
        
        // Get bucket parameters
        int numBucketsX = getIntegerParam(masterArray, 12, contactInterfaceId);
        int numBucketsY = getIntegerParam(masterArray, 13, contactInterfaceId);
        int numBucketsZ = getIntegerParam(masterArray, 14, contactInterfaceId);
        int totalBuckets = numBucketsX * numBucketsY * numBucketsZ;
        int bucketLength = getIntegerParam(masterArray, 89, contactInterfaceId);
        
        // Allocate bucket-related arrays
        allocateBucketArrays(masterArray, totalBuckets, bucketLength);
        
        // Allocate stiffness array (NSN)
        allocateStiffnessArray(masterArray, numSlaveNodes);
        
        // Allocate left/right node arrays (NSN)
        allocateNodeArrays(masterArray, numSlaveNodes);
        
        // Allocate area arrays
        allocateSlaveAreaArray(masterArray, numSlaveNodes);
        allocateMasterAreaArray(masterArray, numSegments);
        
        // Allocate master segment coordinates (12*NRTM)
        allocateMasterCoordinates(masterArray, 12 * numSegments);
        
        // Allocate master mass array (NRTM)
        allocateMasterMassArray(masterArray, numSegments);
        
        // Allocate friction array (3*NSN)
        allocateFrictionArray(masterArray, 3 * numSlaveNodes);
    }
    
    void countBoundaryElements(std::vector<int>& masterArray, int contactId, int numMasterNodes) {
        // Implementation would count boundary elements
        // Equivalent to COUNTBE in original
    }
    
    void checkMasterSegments(
        std::vector<int>& masterArray, int contactId, 
        int numSegments, int totalNodes
    ) {
        // Allocate temporary flag array
        allocateRigidBodyFlagArray(masterArray, totalNodes);
        
        // Perform validation check
        validateMasterSegments(
            masterArray, 
            getMasterSegmentConnectivity(masterArray, contactId),
            getRigidBodyIDs(masterArray),
            getShellIDs(masterArray),
            getElementTypes(masterArray),
            getRigidBodyCounts(masterArray),
            getRigidBodyFlagArray(masterArray),
            getGlobalNodeIDs(masterArray, contactId),
            getYArray(masterArray),
            numSegments
        );
        
        // Clean up flag array
        deallocateRigidBodyFlagArray(masterArray);
    }
    
    void computeStiffnessProperties(
        std::vector<int>& masterArray, int contactId, int totalNodes,
        int numSegments, int numSlaveNodes, Real scaleFactor, 
        Real minArea, int mpiBufferSize, Real& maxStiffness
    ) {
        // Implementation would compute stiffness and thickness properties
        // Equivalent to STF15 in original
    }
    
    void updateParameters(
        std::vector<int>& masterArray, int contactId, 
        Real minArea, Real maxStiffness
    ) {
        // Store computed parameters back in master array
        // Equivalent to RPARMPUT calls in original
    }
    
    void updateInterfaceLabel(int contactId) {
        // Update the contact interface label
        // Equivalent to PUTSLINTLB in original
    }
    
    // Additional helper methods would be implemented here...
};